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Seyed Nikan Hossein Attar A01230368 ELEX 2105: Circuit Analysis 2 Page 1 of 9
The original document was provided by Mark Lane and Norm Cousins Lab 10: 3-Phase systems, Wye-loads
Objective •
Verify the voltage magnitude and phase relationships for a 4-wire, 3-phase supply. •
Verify the voltage, current and power relationships for balanced and unbalanced wye loads. Introduction The lab is supplied by a 208/120 V, 4-wire system. For safety reasons we do not use these voltages. The 3-
phase “box” on the bench:
a)
‘Plugs in’ to the 208 V lab system.
b)
Contains 3 transformers. c)
Steps the lab voltages down to 28/16 V. d)
Isolates the output voltages from ground. Identify the output terminals on the 3-phase box: Green
ground (earth) –
connects to the metal chassis and to the 208/120 V system ground through the grounding pin of the power plug. Red
Line A –
from the low voltage side of the transformer bank. Black
Line B –
from the low voltage side of the transformer bank. Blue
Line C –
from the low voltage side of the transformer bank. White
Neutral –
from the low voltage side of the transformer bank. This terminal is ISOLATED from the 208 V lab system.
Seyed Nikan Hossein Attar A01230368 ELEX 2105: Circuit Analysis 2 Page 2 of 9
The original document was provided by Mark Lane and Norm Cousins Preparation 1.
Draw a diagram for a 3-phase, 4-wire
, balanced resistive load Y-Y system. Use capital letters for the generator side and small letters for the load side to label the nodes. Put a 1 ohm current sampling resister on line A and a 10 ohm sampling resistor to measure the current in the neutral line. Use 4 channels of the scope to measure the phase voltages on the generator side as well the current in line A (the voltage drop across the 1 ohm sampling resistor). 2.
Redraw the diagram for a 3-wire
system similar to the previous one. The load wye-point is now disconnected —
name this node ‘y’.
Seyed Nikan Hossein Attar A01230368 ELEX 2105: Circuit Analysis 2 Page 3 of 9
The original document was provided by Mark Lane and Norm Cousins 3.
Prepare the following table for the supply voltage. VAN VBN VCN VAB VCA θVAN
- θVBN
θVAN
- θVCN
θVBN
- θVCN
θVAB
- θVCA
θVAB
- θVBC
16 16 16 16 28.4 27.3 120 -120 120
Seyed Nikan Hossein Attar A01230368 ELEX 2105: Circuit Analysis 2 Page 4 of 9
The original document was provided by Mark Lane and Norm Cousins 4.
Prepare the following table for the measurements Balanced 4-wire Balanced 3-wire Unbalanced 4-wire Unbalanced 3-wire Van/ay 16 15.8 15.7 17.4 Vbn/by 16 16.3 15.9 10.5 Vcn/cy 16 16.1 15.8 21.2 Ia 0.02875 0.02821 0.02804 0.03107 Ib 0.02875 0.02875 0.1325 0.0875 Ic 0.02857 0.02875 0.07182 0.09636 Vab 28.4 28.2 28.1 27.5 IAa 0.02875 0.02821 0.02804 0.03107 In 0 n/a 0.0769 n/a θVab
-
θIa
30 28.7 30 10.3 Vyn N/A 0.151 N/A 6.14 Pt (1st method) 1.38289 1.37729 3.68164 3.5023 Pt (2nd method) 1.22475 1.20879 Pre-lab requirements: •
Two schematics showing all the probes. •
One table for the measured values at the source side •
One table to record the measurements of the load side. •
No prediction or calculation is needed.
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